kubernetes master 高可用一键部署

#地址见：https://github.com/SILLKY/kubernetes-pro/tree/master/Master-HA
#包括其他一些文件，适当版本1.6.1
#!/bin/bash

host=master.k8s
host1=master1.k8s
host2=master2.k8s

ip0=192.168.255.125
ip1=192.168.255.126
ip2=192.168.255.127

#etcd数据备份
kube::etcd_backup()
{

  docker stop etcd_test&&docker rm etcd_test
  rm -rf  /home/etcd && cp -r  /var/lib/etcd /home
  docker  run --name etcd_test -d -p 12379:2379 -p 12380:2380 -v /home/etcd:/data appcelerator/etcd:3.0.15
  echo '备份数据完毕'
}

#复制需要的文件到node节点
kube::copy_file()
{
    #修改本机的etcd和apiserver
  cp   etcd.yaml /etc/kubernetes/manifests/
  cp  kube-apiserver.yaml  /etc/kubernetes/manifests/kube-apiserver.yaml

  #修改mininode节点上的配置
  scp  /etc/hosts root@$host1:/etc/
  scp  /etc/hosts root@$host2:/etc/

  scp  -r /etc/kubernetes/manifests  root@$host1:/etc/kubernetes/
  scp  -r /etc/kubernetes/pki  root@$host1:/etc/kubernetes/
  scp  /etc/kubernetes/controller-manager.conf  root@$host1:/etc/kubernetes/
  scp  /etc/kubernetes/scheduler.conf  root@$host1:/etc/kubernetes/
  scp  /etc/kubernetes/admin.conf  root@$host1:/etc/kubernetes/
  scp  etcd1.yaml  root@$host1:/etc/kubernetes/manifests/etcd.yaml
  scp  kube-apiserver1.yaml  root@$host1:/etc/kubernetes/manifests/kube-apiserver.yaml
  scp  create-pki1.sh root@$host1:/root/create-pki.sh

  scp  -r /etc/kubernetes/manifests  root@$host2:/etc/kubernetes/
  scp  -r /etc/kubernetes/pki  root@$host2:/etc/kubernetes/
  scp  /etc/kubernetes/controller-manager.conf  root@$host2:/etc/kubernetes/
  scp  /etc/kubernetes/scheduler.conf  root@$host2:/etc/kubernetes/
  scp  /etc/kubernetes/admin.conf  root@$host2:/etc/kubernetes/
  scp  etcd2.yaml  root@$host2:/etc/kubernetes/manifests/etcd.yaml
  scp  kube-apiserver2.yaml  root@$host2:/etc/kubernetes/manifests/kube-apiserver.yaml
  scp  create-pki2.sh root@$host2:/root/create-pki.sh
}

# 修改相应的配置
kube::edit_file()
{
  sed -i "s/{{ip}}/$ip0/g" /etc/kubernetes/manifests/kube-apiserver.yaml
  rm -rf /var/lib/etcd

  ssh root@$host1 "sed -i \"s/{{ip}}/$ip1/g\"" /etc/kubernetes/manifests/kube-apiserver.yaml
  ssh root@$host1 "sed -i \"s/{{ip}}/$ip1/g\"" /root/create-pki.sh
  ssh root@$host1 "sed -i \"s/$ip0/$ip1/g\"" /etc/kubernetes/admin.conf
  ssh root@$host1 "sed -i \"s/$ip0/$ip1/g\"" /etc/kubernetes/kubelet.conf
  ssh root@$host1 "sed -i \"s/$ip0/$ip1/g\"" /etc/kubernetes/controller-manager.conf
  ssh root@$host1 "sed -i \"s/$ip0/$ip1/g\"" /etc/kubernetes/scheduler.conf
  ssh root@$host1 'cd /root &&chmod +x create-pki.sh&&./create-pki.sh'
  ssh root@$host1 'rm -rf /var/lib/etcd'

  ssh root@$host2 "sed -i \"s/{{ip}}/$ip2/g\"" /etc/kubernetes/manifests/kube-apiserver.yaml
  ssh root@$host2 "sed -i \"s/{{ip}}/$ip2/g\"" /root/create-pki.sh
  ssh root@$host2 "sed -i \"s/$ip0/$ip2/g\"" /etc/kubernetes/admin.conf
  ssh root@$host2 "sed -i \"s/$ip0/$ip2/g\"" /etc/kubernetes/kubelet.conf
  ssh root@$host2 "sed -i \"s/$ip0/$ip2/g\"" /etc/kubernetes/controller-manager.conf
  ssh root@$host2 "sed -i \"s/$ip0/$ip2/g\"" /etc/kubernetes/scheduler.conf
  ssh root@$host2 'cd /root &&chmod +x create-pki.sh&&./create-pki.sh'
  ssh root@$host2 'rm -rf /var/lib/etcd'

}

# 重启kubelet
kube::reset_kubelet()
{
  systemctl daemon-reload
  systemctl restart kubelet
  ssh root@$host2 'systemctl daemon-reload'
  ssh root@$host2 'systemctl restart kubelet'
  ssh root@$host1 'systemctl daemon-reload'
  ssh root@$host1 'systemctl restart kubelet'
}

# 恢复etcd的数据到新的集群中
kube::etcd_recover()
{
  #等待ETCD集群启动完毕
  while :
  do
      result=$(kubectl  get componentstatuses)
      result0=$(echo $result | grep 'etcd-0 Healthy {"health": "true"}')
      result1=$(echo $result | grep 'etcd-1 Healthy {"health": "true"}')
      result2=$(echo $result | grep 'etcd-2 Healthy {"health": "true"}')
      if [[ $result0 != ""  &&  $result1 != ""  &&  $result2 != "" ]]
      then
        echo "etcd集群启动完毕"
        break
      else
        echo "等待etcd集群启动......"
     fi
     sleep 10
  done
  sleep 30
  echo '准备还原数据'
  echo "export ETCDCTL_API=3&&etcdctl make-mirror $ip0:2379  --endpoints=$ip0:12379"
  docker  exec  etcd_test sh  -c "export ETCDCTL_API=3&&etcdctl make-mirror $ip0:2379  --endpoints=$ip0:12379"&
  echo '等待还原数据.....'
  sleep 60
  docker stop etcd_test && docker rm etcd_test
}

# 最后设置loadBalace
kube::loadBalace()
{
  #设置代理为loadBalaceIp
  loadBalaceIp=kubernetes.default.svc
  kubectl get configmap/kube-proxy -n kube-system -o yaml > kube-proxy-configmap.yaml
  sed -i "s/$ip0/$loadBalaceIp/g" kube-proxy-configmap.yaml
  kubectl apply -f kube-proxy-configmap.yaml

  #删除flanne,kube-proxyl让其自动重建
  kubectl delete pod -l app=flannel -n kube-system
  kubectl delete pod -l k8s-app=kube-proxy -n kube-system
}

main()
{
  kube::etcd_backup
  kube::copy_file
  kube::edit_file
  kube::reset_kubelet
  kube::etcd_recover
  kube::loadBalace
  sleep 20
  echo "-------------------------------------------------------"
  echo "已经完成master HA"
  echo "-------------------------------------------------------"
  kubectl get pods -n kube-system -o wide
}
main $@